I am 6 foot 7 inches and average size arms...

Paddle length is usually more based on the size of the paddler, but it is important to have the right style paddle for your use. This paddle, with the longer narrower blade (when compared to Aquabound's Mantaray) is designed for a "low angle" paddle stroke which is a more relaxed stroke. The Mantaray for example is more of a high angle paddle which would be used for a faster or more powerful stroke. Use Werner's Paddle fit guide here to help you out: http://wernerpaddles.com/fit_guide_widget/ Also, for what its worth, in all the sea kayak guiding I've done, we offered 230 and 240 paddles to everyone except kids who got 210s. At 6'1'', so quite a bit smaller than yourself, I prefer the longer paddle for sea kayaking. I'm not quite sure what you mean by "cruising," but I would venture that the 240 would be your best bet. Check the paddle fit guide to make sure you're getting the right blade type for your uses, and you should be set! Good Luck!